1 /* 2 Simple example demonstrating creating a one sub-network DMNetwork in parallel. 3 4 In this example vertices 0 and 1 are not connected to any edges. 5 */ 6 7 #include <petscdmnetwork.h> 8 9 int main(int argc,char ** argv) 10 { 11 DM network; 12 PetscMPIInt size,rank; 13 MPI_Comm comm; 14 PetscInt e,ne,nv,v,ecompkey,vcompkey; 15 PetscInt *edgelist = NULL; 16 const PetscInt *nodes,*edges; 17 DM plex; 18 PetscSection section; 19 PetscInt Ne,Ni; 20 PetscInt nodeOffset,k = 2,nedge; 21 22 PetscFunctionBeginUser; 23 PetscCall(PetscInitialize(&argc,&argv,NULL,NULL)); 24 PetscCall(PetscOptionsSetValue(NULL,"-petscpartitioner_use_vertex_weights","No")); 25 comm = PETSC_COMM_WORLD; 26 PetscCallMPI(MPI_Comm_rank(comm,&rank)); 27 PetscCallMPI(MPI_Comm_size(comm,&size)); 28 29 PetscCall(DMNetworkCreate(PETSC_COMM_WORLD,&network)); 30 31 /* Register zero size components to get compkeys to be used by DMNetworkAddComponent() */ 32 PetscCall(DMNetworkRegisterComponent(network,"ecomp",0,&ecompkey)); 33 PetscCall(DMNetworkRegisterComponent(network,"vcomp",0,&vcompkey)); 34 35 Ne = 2; 36 Ni = 1; 37 nodeOffset = (Ne+Ni)*rank; /* The global node index of the first node defined on this process */ 38 39 /* There are three nodes on each rank and two edges. The edges only connect nodes on the given rank */ 40 nedge = k * Ni; 41 42 if (rank == 0) { 43 nedge = 1; 44 PetscCall(PetscCalloc1(2*nedge,&edgelist)); 45 edgelist[0] = nodeOffset + 2; 46 edgelist[1] = nodeOffset + 3; 47 } else { 48 nedge = 2; 49 PetscCall(PetscCalloc1(2*nedge,&edgelist)); 50 edgelist[0] = nodeOffset + 0; 51 edgelist[1] = nodeOffset + 2; 52 edgelist[2] = nodeOffset + 1; 53 edgelist[3] = nodeOffset + 2; 54 } 55 56 PetscCall(DMNetworkSetNumSubNetworks(network,PETSC_DECIDE,1)); 57 PetscCall(DMNetworkAddSubnetwork(network,"Subnetwork 1",nedge,edgelist,NULL)); 58 PetscCall(DMNetworkLayoutSetUp(network)); 59 60 PetscCall(PetscPrintf(PETSC_COMM_WORLD,"Network after DMNetworkLayoutSetUp:\n")); 61 PetscCall(DMView(network,PETSC_VIEWER_STDOUT_WORLD)); 62 63 /* Add components and variables for the network */ 64 PetscCall(DMNetworkGetSubnetwork(network,0,&nv,&ne,&nodes,&edges)); 65 for (e = 0; e < ne; e++) { 66 /* The edges have no degrees of freedom */ 67 PetscCall(DMNetworkAddComponent(network,edges[e],ecompkey,NULL,1)); 68 } 69 for (v = 0; v < nv; v++) { 70 PetscCall(DMNetworkAddComponent(network,nodes[v],vcompkey,NULL,2)); 71 } 72 73 PetscCall(DMSetUp(network)); 74 PetscCall(DMNetworkGetPlex(network,&plex)); 75 /* PetscCall(DMView(plex,PETSC_VIEWER_STDOUT_WORLD)); */ 76 PetscCall(DMGetLocalSection(plex,§ion)); 77 PetscCall(PetscSectionView(section,PETSC_VIEWER_STDOUT_WORLD)); 78 79 PetscCall(PetscFree(edgelist)); 80 81 PetscCall(DMNetworkDistribute(&network,0)); 82 PetscCall(PetscPrintf(PETSC_COMM_WORLD,"\nNetwork after DMNetworkDistribute:\n")); 83 PetscCall(DMView(network,PETSC_VIEWER_STDOUT_WORLD)); 84 PetscCall(DMNetworkGetPlex(network,&plex)); 85 /* PetscCall(DMView(plex,PETSC_VIEWER_STDOUT_WORLD)); */ 86 PetscCall(DMGetLocalSection(plex,§ion)); 87 PetscCall(PetscSectionView(section,PETSC_VIEWER_STDOUT_WORLD)); 88 89 PetscCall(DMDestroy(&network)); 90 PetscCall(PetscFinalize()); 91 return 0; 92 } 93 94 /*TEST 95 96 build: 97 requires: !complex double 98 99 test: 100 nsize: 2 101 args: -petscpartitioner_type simple 102 103 TEST*/ 104